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A convex lens can be used to start a fire .how and why?

Answer»

Answer: Convex Lens. This is a lens in which both SURFACES are curved so that a beam of LIGHT PASSING through it is brought to a POINT or focus. A convex lens can be used to start a fire by directing the sun's rays to a point (your tinder) so it should only be used on bright, SUNNY days.



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